Why are there pieces of blue fabric in the walls of the elevator?

Why are there pieces of blue fabric in the walls of the elevator?
Why are there pieces of blue fabric in the walls of the elevator?

They’re there to protect the insides of the elevator from getting scratched and otherwise broken by the construction. We often need to move big tools or other equipment upstairs, and the elevator is the best way to do that. The blue fabric is dense and doesn’t tear easily, providing a protective barrier. The same is true for the blue sticky paper on the floor in some parts of the library.